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Cisco Bug: CSCtb71889 - DNS query response is dropped on a NAT-PT router

Last Modified

Feb 02, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(24)T1

Description (partial)

Symptoms: DNS A-answer from IPv4 DNS server (which is supposed to be forwarded
to IPv6 side as AAAA-answer) is dropped on NAT-PT routers.

Conditions: The symptom is observed when DNS NAT-ALG is enabled.
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